Donald



C. T. MCDONALD.

REFILLABLE CARTRIDGE FUSE.

APPLICATION man MAY28 ,1917,

1,3 1 1 ,66 1 Patented July 29, 1919.

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UNITED sTATEs PATENT oEEIoE.

CLARENCE T. McDONALD, 0F CHICAGO, ILLINOIS, ASSIGNOR TO MULTI REFILLAIBLE FUSE COMPANY, OIE CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

REFILLABLE CARTRID GIE-FUSE.

Specification of Letters Patent.

Patented July 2e, 1919.

Application led Hay 28, 1917. Serial No. 171,356.

To all whom it may concern:

Be it known that I, CLARENCE T. Mo- DoNALD, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Refillable Cartridge-Fuses, of which the following is a specification.

This invention relates to vinclosed or cartridge fuses of the refillable type, wherein the fusible element is, removably mounted in its casing so that the fuse element may be renewed or replaced by another when disrupted.

One of the objects of the invention is to provide improved means. for securing the fuse terminals to the ends vof. the tubular casing. and the invention refers more particularly to a fuse of the blade-terminal type and to the means for rigidly'securing the blades against lateral longitudinal or rotational movement. n

Another` object is to provide .aL-@construction arranged to prevent the escape of ame along the terminals when the fuse is disrupted. l f

In the drawings, Figure 1 is a; longitudinal central sectional view' of a blade type of fuse embodying my invention. `Fig. 2 is a similar view of one end of the fuse taken in a plane at right angles to Fig. 1 and on line 2-2 thereof. Fig. 3 is a transverse sectional view taken on line 3 3 of Fig. 1. Fig. 1 is a detail side view of one of the ter-l minal blades and its packing sleeve. Fig. .5 is a detail view of the improved locking washei` employed.

` A hollow cylindrical Sleeve or shell 10 of non-conducting and non-inflammable material is provided at its endswith suitable means for iuunovably holding a unitary fuse device therein. unitary fuse device as Composed of the knife-blaulc terminals-11 andthe fusible element 12 detachably secured together by suitable means such as the bolts 13, nuts 14 and washers .15. Ifpon each end of the shell 10 is suitably and rigidly secured a tubular head 1G provided with opposed, transverse, inwardly-extending segmental webs 17. The webs at opposite ends of the shell are alined with each other. The fuse element with bosses 21.

Herein I have shown said the attached terminals is passable longitudinally through the shell and' ferrules, and, when centrally positioned, may be rotated to bring shoulders 18 formed on the terminals 11 into engagement with the outer faces of the webs 17. The unitary fuse device is thus locked against longitudinal movement in the shell, as long as the fusible element .12 remains intact.

To lock the fuse device against rotation, I provide the following means: A washer 19, suitably slotted as at 20, non-rotatably engages the terminal blade 11 and is slidable thereon. Upon one face of the washer are formed or otherwise secured abutments or These bosses are so positioned that when the washer is seated against the head 16 or the webs 17 the bosses engage the edges of the projecting webs 17 to lock the washer as well as the terminal blade and fuse element against lateral movement or rotation. To secure the before-mentioned parts in place, .an annular end cap 22 is provided which passes around the terminal blade and is suitably secured to the head 16 or shell 10. Herein I have shown the end cap screwed upon the hea-d, thereby clamping the locking washer between the head and the end cap.

n Upon each termina-l blade 11 is formed or suitably secured an encircling flange or sleeve 23,-best seen in Figs. 2 and 4,'and which is adjacent .to the washer 19. Between the said sleeve and washer is provided noninfiammable packing material 24 which is compressed to form a -gas-tight joint about the slot 20 when said end cap is screwed down upon the ferrule and engages saidv 23 or equivalent form of abutment on the blade.

While I have herein a'described in consid- 6. A rellable cartridge fuse having, in

' erable detail the preferred embodiment of combination, a tubular shell, an'inwardly projecting transversely disposed webl rigidly and means to secure all of my invention, I would have it understood projecting transversely disposed web secured that I do not'thereby intend to limit myself thereto, a unitary fuse device extending to the Vform disclosed vsince many modicathrough the shelland comprisinga fusible tions will be readily apparent to those element and a terminal detachably secured skilled in the art. The scope of the invento said element, said terminal having a cuttion will be pointed Vout in the appended away portion for engagement with said web, claims. A- a washer embracing said terminal, bosses I claim as my invention: lon said washer engaging said web, means 1.. A refillable cartridge fuse havingin fixedly secured to said terminal, packing combination, a tubular-shell, an inwardly means adjacent said last mentioned means,

said parts tosecured to an end of said shell, a unitary gether. fuse device extending through said shell and 7 A reillable cartridge fuse having, in having a portion directly engaging said web, combination, a tubular shell, a tubular head a washer, an abutment on said washer env rigidlyv secured toan end of said shell, an

u gaging the inneredge of said webxto hold inwardly projecting 'transversely disposed t the' washer against rotation with relation to web rigid with said head, a fuse terminal the shell, and means to secure all ofsaid blade extending-through said head and havparts together.` Y ing a portion directly engaging said web, a

2. A retillable cartridge fuse having, in washer slotted to receive said blade, an abut# n combination, a tubular shell, an inwardly ment on said washer to coperate withthe projectingtransversely disposed web secured inner edge of said web in holding said to an end of said shell, a unitary fuse dewasher against rotation with relation to saidvice extending through said shell and hav'- shell, and means to secure all of said parts gether.

ing aprtion directly engaging said web, a together.

washer slidable .upon ,said fuse device,pack 8. A4 relillable cartridge fuse having,` in ing means on said fuse device coperating combination, a tubular shell, a transverse, with said washer to form a gas-tight joint, web at one end thereof, a fuse-terminal blade and means tofsecure all of said parts to extending through said shell and having a portion to abut directly against said web, a

3. A rellable cartridge" fuse having, in

combination, a tubular shell, aunitary fuse having an interlocking engagement with device extending through said shell, a slotsaid web, packing means adjacent said' ted Washer secured tothe shell in direct enwasher and surrounding the joint between gagement withtheend thereof and embrac, said washer and said blade, and means to -ing said fuse device, an abutment fixedly secure all of said parts together and comsecured to said fuse device, packing material press said packing material.

between said washer and said abutment, and 9. A refillable cartridge fuse having, in an end cap to secure all of said parts tocombination, a tubular shell, -a segmental gether.

4. A refillable cartridge fuse having, in lextending through said shell, an apertured combination, a tubular shell, a pair of oppowasher receiving said fuse device and engagsitely positioned and inwardly projecting ing the inner edge of said web, packing transversely disposed webs secured thereto, means adjacent said washer and surrounda unitary fuse device extending through ing the joint between said washer and said the shell -and having cut-away portions for fuse device, and an end cap to secure all of direct engagement with said webs, a washer said parts together and compress said packembracing said fuse device, bosses on the ing means.

washer engagmg the in ner edges of said 10. Arellable cartridge fuse comprising,

webs, andmeans to secure all of said parts in combination, a rigid tubular body, an

together. Y apertured washer closing` one end of the 5. A refllable cartridge fuse having, in body, a terminal passing through the apercombination, a tubular shell, an inwardly ture in said washer and having shoulders projecting transversely disposed web secured adapted to directly engage the end of said thereto, 'a unitary fuse dev ice extending body to limit inward movement of said through the shell and comprlsing a fusible terminal, means on said terminal coperatelement and a terminal detachably secured ing with said Washer to limit outward moveto said element, said terminal having a cutment of the terminal, and means for securaway portion for engagement with said web, ing said washer to the body. a washer embracing said terminal, .a boss on 11. A refllable cartridge fuse comprising,

' said washer engaging the inner edge of said -in combination, an insulating sleeve, a tubuv together.

web, and means to 'secure all of said parts larmetallic head fixed on one end of said sleeve, a .slotted washer closing;I oneA end of web at the end thereof, a unitary fuse device said head and sleeve, means to prevent relative rotation of the washer and head, a termnial blade passing through the slot in said Washer and having shoulders arranged to abut againstthe outer end of said head `to limit inward movement of said blade,

beingof irregular or non-circular shape, an

apertured washer closing the outer end of said head and having means conforming to the irregularity of said interior of the head, whereby to prevent relative rotation of the washer and the head, a terminal passing through the aperture in said washer, means for preventing longitudinal movement of the terminal, and means for securing the washer to the head.

13. A rellable cartridge fuse comprising, in combination, a tubular body portion, a single washer positioned across one end thereof, aterminal blade passing'through said washer, means on said blade to engage said body portion to limit longitudinal movementj of the blade in one direction, means fixed on said blade to engage said washer to limit longitudinal movement of the blade in the opposite direction, means for preventing relative rotary movement between thel washer and the body portion, and means for securing said washer to the body portion.

14. A rellable cartridge fuse'comprising, in combination, an insulating sleeve having av pair of metallic heads fixed 'on opposite ends thereof and provided with irregularly shaped openings, a unitary fuse device comprising a pair of terminal blades joined by a fusible section detachably secured to said blades, said blades and fusible section being insertible as a unit, through said sleeve and heads and being then rotatable to cause parts on said blades and said heads to interlock to prevent longitudinal movement of said unitary device, and means for securing the blades tothe respective heads in such interlocke'd position.

- 15. A refillable cartridge fuse comprising,

vi'ncombination, an insulating sleeve having a pair of tubular metallic heads fixed on its ends, a unitary fuse device comprising two. terminal blades joined by a fusible section, said device being insertible longitudinally through said sleeve and heads, said blades having shoulders and said heads having inwardly extending webs into engagement with which said shoulders may be the body in fixed position, and means carried solely by said terminal for preventing the escape of gas or flame around the surface of said terminal.

17. A refillable cartridge fuse comprising,

in combination, a-tubular body, a terminal blade, a slotted washer through which said blade extends, means for preventing rotation of said washer, means for securing said washer to the body, and packing means carried solely by said terminal blade surrounding the blade adjacent to the slot in said washer and arranged to prevent the escape of gas or flame through the slot.

18. A refillable cartridge fuse comprising, in combination, a tubular body, a terminal blade, a slotted washer through which said blade extends, means for preventingrotation of said washer, means for securing said washer to the body, a continuous ledge fixed on the blade at the inner side of said washer, and packing material between said ledge and said washer arranged to prevent escape of gas or flame through the slot in the washer. y

19. In an inclosed cartridge fuse, a rigid tubularbody having an open end, and a washer forclosing said open end having a centralelongated slot to receive a terminal blade and having on one of its side faces a plurality of projections spaced inwardly from the periphery of the washer, the tubular body being shaped to coperate with said projections to hold the washer against rotation relative thereto.

`20. In an inclosed electric fuse, a knife blade having a portion at one edge cut away to provide a stop shoulder and having an web, a unitary fuse device comprising a pair of terminal blades joined by a vfusible section and each having a shoulder directly engaging the webs in the respective heads, a slotted washer surrounding each of said terx'ninals, and means' vfor;elanzuping' washers in position othe'ends vofthe heads.

22.`Inl an inclosv eleotriez'fuse, an `insulating sleeve, a tubular metallic headon in one positicnin'abtting engagement only with said web, said device being when .1n

anotherl position movable through the head 10 vpastfsai'd web;

. 5 the end of said sleeve 'having aninward1y projecting web, a "unitaryafqs'e devieegiand means forvholding. said device when In testimony whereof, I have herelinto set" my hand. CLARENCE MCDONALD. 

